System of radiotelephony.



W. SGHLOEMILOH 81; P. P. PIGHON.

SYSTEM OF RADIOTELEPHONY. APPLICATIJION FILED NOV. 29, 1907.

l ,O52,8%9, Patented Feb. 11,1913.

WQZW fmwm ens. on the trap VTIZHELM SGELGEMILGE, (3F BERLEN, Alli) PERI FERNAND PICHON, 9E SUDENDE,

To all whom it may emcee-m:

Be it known that We Vi nius-mi Sensor:- niiccn, engineer, a. subject of the King of Prussia, residing at Berlin, Germany, entl PAUL FERNAND Fiction, engineer, a citizen of the Republic or" France, residing at iliicle'nde near Berlin, Germany. have in vented a new System of .lscliotelcphony. of which the following is a exact (lescriptioin 'ei'ei'ence being heel to the accompanying drawing, lorming a part of this specification.

The object cl tie present invention is .2. new system of rurlio telephony in which the transmitter is excited by means of continuous oscillations of constant amplitude in accordance with the known svstem of Thompson-l)Luliicll, moreover the serial ti'uusniiitti' g conductor lS"QIPOSB-Cl directly to the altc oiioiis of the resistance of microphone instead of through the medium of the exciting circuit.

Another esse itiul fou'ci' mittcr circuit between the receiving circuit tor circuit at the receiving A special ""l uliuge of the new 7 resides in 1. act that resonance chewinx and receiver station which are extremely (lGlS'lDi ii to the distinct transmission of the "WOlflS, erecbviete T he well-known method of increasing thq amplitude of oscillations in receivers by means of resonance inevitably results in an essential alteration of the shape of the osc'llution. ln Wirelessv telephony it however essenllol for clear reproduction to have the shape of the curve in the telephone identical to the shape of the energy curve of the system containing the microphone. For this purpose the transmitter microphone is connected. to the excite!- circuit but to the 'iLFPLYESZDlllQl tllll;3l'lfil.

some time the )uriose of melting the ameli- Specification of letters Futcut,

full, clear, and

T6 GESELLSCHAFT Fil'R DRAI-ITLOSE TELE-' 3 .3., A GGRPUEATXGH' OLE GERMANY.

9F RADHBTEEEFHQYBYY.

Feb. ll, 1W1

tutle of the oscillations in the aerial conductor vesy gsent attained, inasmuch as rcs-"stnce variations result in great V31)- ations oi the radiating prooerties of the aerial contluctor in case of loose coupling. Contrary to the usual scheme of connections for truiusmission with undumped oscillations or only slightly clumped oscillations an im tegrating detector is connected to the rccalving serial conductor either directly or by" means-3f a resonance circuit in such" a manner that the serial conductor is made practically Rj'fillUCllQ' In consequence, the

energy that hasbeen received is transmitted to the detector instantly and produces in the telephone currents or variations of u direct current which are exactly in accordance with the amplitude of the high frequency currents in the transmitter.

accompanying drawings shmv diegrammatically an application of the presout in. eniion in tWo modifications.

Figure 1 is a diagram of a, transmitter station, according to the invention. Fig. 2 is a diagram of the cooperating receiving station. Fig. 3 is a diagram of a modification shown in l, and Fig. 4; is a clieol the cooperating receiving stetioi;

also modified accordingly.

In Fig.- l 0; indicates the transmitter circuit or aerial conductor which is connected to the microphone circuit I) inductively by means of a, rigid couplin The transmit- 'ter circuit is exciteu by means of the closed excite? circuit 6, which is energized by a circuit containing dynamo r, regulatuble resistsnce g1, choking coils 0 and switch q. The circuit 0 is tuned to the transmitter circult and contains an erci-d for the production ofunilemped waves, the coupling between the exciting circuit sndthe transmitter circuit hein less than 3%. i

In Fig. 2' f indicates the receiver circuit which is connected inductively, to the detector circuit 9. The detector circuit forms a resonance circuit which contains high self inductionand o condenser is of low capacity; an integrating detector in for instance In a case of kind the resonance circuit must naturally coupleu as rigidv as possible with the serial conductor.

- In series with the detector is is a condenser i to which an indicator Z for instance a telephone and a' source m of direct current energy is connected. The condenser i serves as blocking condenser with regard to the direct current produced by the current source m.

Instead of the inductive coupling be tween the microphone circuit and the transmitter circuit and between the detector-circuit and the receiver circuit in both cases a COIH uctive connection may be used, as shown. in Figs. 3 and 4. 1 As will be seen in Fig. 3, the microphone circuit 71 is conductively connected to the transmitter circuit, and from Fig. 4 it will. be seen that the detector circuit is conductively connected to the receiver circuit.

Having explained our invention, what we do claim and desire to secure by Letters Patent is:

1. In a system for ,radio-telephony' a transmitter circuit, an exciting circuit coupled with the transmitter circuit, means for producing continuous oscillations of constant amplitudes in the exciting circuit, a microphone electrically connected'with the transmitter circuit for directly influencing the same, a receiver circuit, an integrating detector, an indicator connected with the receiver circuit, the coupling between the eX-. citing circuit and the transmitter circuit being less than 3%, substantially as described. Y

In a system" for -radio-telephony a transmitter circuit, an excitingcircuit, coupled with the transmitter circuit, means for producing continuous oscillations of constant amplitudes in the exciting circuit, a microphone electrically connected with the transmitter circuit for directly influencing I the same, a receiver circuit, an integrating detector, an indicator connected with the re'- ceiver circuit, the coupling between the exciting circuit and the transmitter circuit being less than 3% and the coupling between the receiver circuit and the integrating detector being as rigid as possible, substantially as described. 7

In Witness whereof we hereunto subscribe 'our names, at Berlin this 12th day of Noveinber A. D. 1907.

WILHELM SCHLOEMILCH. PAUL FERNAND PIOHON.

Witnesses:

VVOLDEMAR HAUPT, HENRY HAsrnu.v 

